[v5.0.0] Angular 6.x compatibility

[v4.0.0] More consistent meta tag updates

* Switched to canActivate Guard-based updates instead of router events
Fixes #7

[v3.0.1] WIP support for server-side rendering

* Set the property attribute for Opengraph tags

[v3.0.0] Angular 5.x compatibility

[v2.0.3] Support for child routes

[v2.0.2] Bugfix for "Duplicate identifier" errors

[v2.0.1] Bugfix for "Duplicate identifier" errors

[v2.0.0] Angular2 final support

[v1.0.0] Bugfix for "meta.config" provider issue